Thanks Alot! Yea the concept has some nice potential if you can get more interesting puzzle components in as well as moveable light sources which would change the shadows etc.
This was our first UE4 game back in 2016 so unfortunately i don't think we will pick this up again.
But if you like the concept then check out Lost in Shadow for Wii where you control a shadow as well as the environment, kind of a hidden gem.